Quick answer
What is USCIS Form N-644 used for?
Under Pub. L. 101-249, use this form to request posthumous citizenship for an alien or noncitizen national whose death resulted from injury or disease incurred on active duty with the U.S. armed services during specified periods of military hostilities. Posthumous citizenship is an honorary status commemorating the bravery and sacrifices of these persons; it does not convey any benefits under the Immigration and Nationality Act to any relative of the decedent. If we approve your application, we will send you Form N-645, Certificate of Citizenship, in the name of the decedent. The certificate only establishes that we consider them to be a citizen of the United States as of the date of their death, and is invalid for all other purposes.
What to prepare before filling N-644
- 01
Confirm that Form N-644, Application for Posthumous Citizenship, matches the specific benefit, request, verification, or record you need.
- 02
Download the current Form N-644 and its separate instructions from USCIS, then compare the edition date before typing any answers.
- 03
For Form N-644, collect the identity records, receipt or account numbers, dates, addresses, and prior immigration documents that support your answers.
- 04
For Form N-644, prepare the travel, residence, marital, tax, selective-service, and character records that apply to the relevant eligibility period.
Current official filing details
The details below are condensed from the USCIS page reviewed on 2026-07-26. Follow the official page and instructions if they differ from this snapshot.
Edition date
04/01/24. You can find the edition date at the bottom of the page on the form and instructions.
Where to file
Mail your completed N-644 application to the California Service Center. USCIS California Service Center P.O.
Box 30113 / ALL OTHER Tustin, CA 92781
Filing fee
You can find the filing fee for Form N-644 by visiting our Fee Schedule page.
Initial evidence
Did you provide the following? Authorization documents from all living next-of-kin above you in order of succession (required unless you are the spouse of a deceased service member, or you are the executor or administrator of their estate).
For more information or examples, please refer to form instructions; A certified copy of your letter of appointment as the executor or administrator of the decedent’s estate, or as the guardian, conservator, or committee of the decedent’s next-of-kin (if applicable); and Evidence that the Department of Veteran’s Affairs recognizes your organization (if applicable).
Official N-644 downloads and filing links
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What is Form N-644 used for?
The certificate establishes only that the person is considered to be a citizen of the United States as of the date of his/her death, and is invalid for all other purposes.
How much does Form N-644 cost?
You can find the filing fee for Form N-644 by visiting our Fee Schedule page.
Can I file Form N-644 online?
The USCIS all-forms directory does not list a general online filing option for this form. Follow the official page for the required filing method.
Related USCIS form guides
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Form G-1651
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Form I-765
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Form I-956
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Form N-300
Application to File Declaration of Intention
Source: U.S. Citizenship and Immigration Services. Independent guide by Clerks AI; not affiliated with USCIS and not legal advice.
Last researched 2026-07-26. Recheck the official page before filing.